// --- Parameters ---
    /* [Primary Dimensions] */
    initial_segment_height = 20;    // "Goes up a few mm" (adjust for your mount)
    run_length = 70;                 // The long section after the turn
    bend_radius = 15;                // Radius of the curve for the "turn"

    /* [Inner Geometry] */
    id_start = 35;                   // Inner Diameter at start (through elbow)
    id_mid = 30;                     // ID after first taper (at 10mm mark)
    id_end = 32.1;                   // Final opening ID

    /* [Outer Geometry] */
    od_initial = 40;                 // Outer Diameter of initial section
    wall_min = 2.5;                  // Min wall thickness (ensures at least 2-3mm)

    /* [Quality Settings] */
    $fn = 100;                       // Resolution of the curves

    // --- Modules & Calculations ---

    // A helper to create a tapered cylinder base on inner/outer diameter over a specific length
    module taper_segment(len, id_start, id_end, od=40) {
        difference() {
            cylinder(h = len, d = od);     // Outer shell
            cylinder(h = len, d1 = id_start, d2 = id_end); // Inner bore
        }
    }

    module assembly() {
        union() {
            // 1. The Initial Straight Section
            // This is the "up" section before the right turn.
            color("cyan")
            translate([0, 0, 0])
            cylinder(h = initial_segment_height, d = od_initial);

            // 2. The Bend (The Right Turn)
            // We use a translated/rotated cylinder to create the "elbow".
            // This creates a smooth transition into the horizontal run.
            color("orange")
            translate([0, 0, initial_segment_height])
            rotate([0, 90, 0]) // Rotate to turn "right" (depending on how you view it)
            cylinder(h = bend_radius * 2, d = od_initial);

            // 3. The Run Section (70mm)
            // This is handled in two parts because of the varying inner taper.
            color("green")
            translate([bend_radius, -run_length, initial_segment_height])
            rotate([0, 0, 90]) // Rotate to lay horizontally
            difference() {
                // The Outer Shell (Gradual outward curve/conic)
                // We use a slightly tapered outer diameter if desired, here kept steady
                // but the inner geometry handles the specific taper logic.
                cylinder(h = run_length, d = od_initial);

                // The Inner Bore Transitions
                // Part A: First 10mm (35 -> 30)
                translate([0, 0, 0])
                cylinder(h = 10, d1 = id_start, d2 = id_mid);

                // Part B: Remaining 60mm (30 -> 32.1)
                translate([10, 0, 0])
                cylinder(h = 60, d1 = id_mid, d2 = id_end);
            }
        }
    }

    // Execute
    assembly();